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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '364b6a5b1bce35333597349494d8382602aa447257d44571ae5d8071165501f0' 
  AND token = 'q9/f/pV30eg6/jQ/KudPP6kyg07CaeOK2EUXUkKnaO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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