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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4503aa3d37f411b551e8925632322fdf03a13ec2bb9fcd49fd6848ff8ff76e2d' 
  AND token = 'HC36PsWgEeS7m6CLYrWTUHGJo4jIpL2BH2qDPulcEbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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