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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29740923007b2389e8ff9ffc85f203bd00bf060b60d8256131a111e4df8521cb' 
  AND token = 'WG3vgLFMFANjCr0cNDDiO4RToEyj+o1E4v6xRwcd5iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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