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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd64f7d071a70ef0ec46850efca1766e54747e61b58c8e06891f0e17597f2c4e1' 
  AND token = 'LdOHo/CZnABb04fQ0G5awgDObQVVLiYBHnS3vlfzs6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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