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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '762901460434af85689f975ce9349735dd01ebfe47626eb8c6c10494cb1e0739' 
  AND token = '9p8td+jaIrKK7tEuIApcMVLEZ2lJ6yW0+94dg/nK18w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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