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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68179eb4bee0f480faf9e6055b008b4c6ac719983230634fdb05f5ffe5c9f7fb' 
  AND token = 'JoM+cM9ZscPgdZQrLgcnTHBcCBeHW5BuyjempU2zpAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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