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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9bd5e035886c7184841319f9e43e921ed658a42e9168676f492b2d00fb652e2' 
  AND token = '3dLH5U+KLqtiM4eYzDn+tiWeGLF020poTpJGfcEOI4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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