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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3304efeb3e32f431cb8a2aa413c1ac58da23046ae4fb4e72f081d5b19d1fbbb3' 
  AND token = 'lxaI6xG8baZ4DdGS42q5l7ZeIbmm/vSMPRu6i5pAAh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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