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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd390931358a1e24f3a9e8cce6d35d6ecfb34b8999fc3d12aca39c0a56b2f1aac' 
  AND token = 'dnx9EGpi24mW57OmGTBjzObEz5n+KcNxD2+5YfpFq7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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