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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '258558b386533bd5370174d2500d1069cc5d58cf8c2679034be2822a41192359' 
  AND token = 'dYai6QTli0nG2jFKx09aX6I5CmPzO1avgI5SYxSHJDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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