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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e3394bdb8310a9fc8be757d9c40d447a886a1c9d8b80304f29094d3ec51c2ef' 
  AND token = '3c7mngdIJLfPUIfGaBI7G7Kvi5SVC9IBLLex+BgHWOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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