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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32c4e239f4bffe2487989d41b1fdd82917f1afc2d450b2c14970f5a2021dcceb' 
  AND token = 'eb3yx7pW682bvLRpzBiE9kOdULBYCJBp9KvYMdlfSSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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