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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5570027c56de353c9e8ed93d3c0eda71b0c83829ecb19635818b78d24cf89b76' 
  AND token = '7EohU+WsoTCZNBM90JUFoOrAGTLgYeDScW89H2L/Vuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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