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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1270f7bc49a2a154488219acfa0950c477891900ce655b055439b5273deee24' 
  AND token = 'cg5DNqnECepw7p16+Msnl83R+0OfGZ+4aqy9SPMwzSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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