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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86a7cfb2a669e4d49fe7d43d491908d0af11b8588b6788d675d2654bd159b2a1' 
  AND token = 'V/0/wI6KP3i8Ssru+bipvL0aEAwvN8I1JED3wMFLLdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}