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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '932b5a8afa7e334b30cfb56fb78e2faae8cf754b01549c279c27759c5ff04dce' 
  AND token = 'Vtqi8vMvcKreJicvBMN3nvt+cQr4XAPmLNc1NnngRm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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