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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94c1d6176bae262a997f712967621f8040c97b00606ef2f59e74d08c706fa4fc' 
  AND token = 'OErVBgi38ak1bHMBHX4GBrTWQA7GctnuvVQ10Alzx1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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