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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a137140071ac0bd626792e5e0b706e1827d146aad9148dea7c3dc51e81379717' 
  AND token = 'iPrTKG0m3dweqYCeJTk4UCCYxMamuSYo8i56EdWDv0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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