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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c45cc9a47ce9cab8856aac7ea89309e2e58f9b33b03abd4e339833b89fa74837' 
  AND token = '0b7y0UPh8hVeqdcpZMF4r5qKuhKVwFZRMhQL5cwxNzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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