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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97823ac90858591ab1b5bb0d80a6831388d3cfecab227e3517d86e90d3ab83a7' 
  AND token = 'wUn1RzR6iojRApf33/oe+A9nt68dZjzFYEr7fpowsuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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