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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4912df35da578d2bdc4984b99c2c63cffbe0c571cb7db5b4a6d08a3b4251cf3e' 
  AND token = 'HZx4Nx+P99RSDPXxsHrA+CZ9AT8x5dkNnnBCDN+VXSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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