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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ce71ff194f1e288143b3b23d53e270723ad01857ed1289a00e4f83cecac7d6b' 
  AND token = 'utIoDJ9CAjqNWLfT7+uxpKZ47DXUCOa0QFg2SJXNErQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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