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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b20b3132049eb520e827c5a2a0f670fb2c92475276f78a2efea1e20d0847b115' 
  AND token = 'bXLAmdFNpopFKyw0DsGi0zxQxtzsBGy5qmd0uEYDto4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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