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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb2558582c3ea1bd3c5519aca8398dbca2134e036c166f7c85ea8f48e36be045' 
  AND token = 'buWiKC2svmmQlZs59vnFy3VLj18Z9BEZkz6ubxBBLik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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