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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f3396b1a0cf751a40a76611b8450f6560d7842512ad86cd26f84ea5860cc102' 
  AND token = 'B4poWdM9kqTaKMvnz6TfzXhQbI5yaiVPDJO2U3yNWWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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