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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3bd2c81acabfb54bec82c593c2a529c791c05f39999d811c96b6327eab3a60e' 
  AND token = 'bSwq1aujtfyzKLxQdaoh1yV6jS0AhqtzhY5yq/L/L48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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