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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff3fe56017b14d75d16935e6115af77c811380d6cfb70ff54ec3008736a8e30e' 
  AND token = 'x67+jpFAeRqf751v2yFGZMpHehj1sdvqQWT+flmX7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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