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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4456be117a81ec04fbfbe762ac664061f3376c1140d11f4cee20285cfb25b772' 
  AND token = 'PeMOTal5SqYDPMRT/x1EmNse5z/dXSf4UExJZi9K/bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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