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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '946b6b7a6a68d2a10ef925d82e0c33125f579d4b917eaea2d3e5e75e9581fd5c' 
  AND token = 'GsI971CNiPZdsL+DNcRHzsbNiTQv/CqywBOEZeDRsLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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