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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6860ddb15a1d71d18c3cd168d6b59eb78405a2da480f3b75930f2112a37187b9' 
  AND token = 'wKLtprI6NiF+OlOud2fUrlrbJ/ZJbQ4S0FZuEtDzhd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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