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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f40c1e40fb6017f69d8c5c4cee00e9d64146625f00524e26feec62dbe01abcf5' 
  AND token = 'quWRIB0LirhNoJm66o0KtdpadRGLjRwqeLUt7ZidqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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