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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b1bd9e05d39fc91df580b65105f1c636e41e252f01aa4a0a5c0db9dce78f8fe' 
  AND token = 'jBr1PwJrmegcMj23DMJbYu++OMItv4bhu4fEtgyCz6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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