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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12a7044e26b9e946d5f3ae099fa1df8b0e58db015cd549e95da87d3224508695' 
  AND token = 'u88r+8x72Bba41tg2+XWskFJZWFho4p3vxLlyMTu19s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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