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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd970567ded3569833a8c3d9b0ed49468fa6bfe97b1609f0849b2077593cc66a' 
  AND token = 'rD0WTWJzwFqLDa+4b0cvb/M6wua0ML/JumrtnpN5Ez8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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