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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3a93ca551723d06a908d4fdd027d183d098d6310f71afe1a896c512d821488a' 
  AND token = 'YzLmDHHT2XkWY1EHHS1ygzPGOCSihuYBsHB88dWtloU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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