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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c4092a1d1ed5f750728b6c2a121624364e4ba12e4bbc7d69201271a1789fd76' 
  AND token = 'dmvutbUdsOXjmAx9aLnhXDwSo6eR+Egf83rz00CblkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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