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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '613793a9adcded117d547d4fda4cbae5ce962013b30f5afd1cfc155c4b675f45' 
  AND token = 'DECE0UQlJ3fPPiIlXFcKf0lKkKpppa7VyKJs+OmTc5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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