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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbbc7c76b00b3fae26bd3ab04007077c521984e2dccb8441ba8d6f0eb0cf58fc' 
  AND token = 'jBfsnLiSyW7AXOXaq7F/WTBWgwvhe0w8QI0QLVXeWjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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