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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cff73777b83d3afaa3059a0ce236feda591bcf56fbe6d5e1df2b9fdf61fd87e5' 
  AND token = 'bxFD2XuUpyWliYkiwsXcZPsbGYn/BR08IWOO6U2pSKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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