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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0f915205c590fb585d9ce1c777aa7e156083426b79e8056c70a094b47d23967' 
  AND token = '92UyHt1tgdlaJsPtasEu+Ee5vtbJOncWF7tevdQ7nOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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