SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '101a00853411199128f3dfe88bcc3d805ab64e44f335c14cf99d7e8424102e0e' 
  AND token = 'jv8i2ZzF3k9a/MKNO43KOVYCEFvDn2LdHXGPUULdAHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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