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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4a58d0230a0735e30cfa877e0233f0a805af2650547803ba98b3bbc24965adb' 
  AND token = 'svHJoqmKhPbFX6rh72KXLibFT5mpXL39ntKmYC2rp4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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