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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3f109631acc865df9c68f94b550b556d9aaf7491492c77527e43d02af998f37' 
  AND token = 'IP4xGnKpM3+oRr1RQy0FCXVNCH5f0A8d9gcYMOcpqpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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