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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b40202013ae29613e823f9b08521ec6bea4b4132a2175917623bdb6a60de7d' 
  AND token = 'EXFSTjK8piF0chIY7JE7BgicN5jl7rdcVKWaxPN9qLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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