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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6e3a5b0af8f81522b52b9832858d39c0544e53de327aabb74b7ed657628e172' 
  AND token = 'JxeANVg3LKjQCB3ggrmhfimHc8XWYB3kPsDjV8a8QEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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