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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b929807fcd098924ca486478f908020e2d262b4961ed58108d2a64de9492646c' 
  AND token = 'rmhe7QzVyYRm1jgfU0tOUONvfSiS5N2NtWodzFWFrF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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