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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a01aef20a7bdac5291f3bf1045757e9aa8fbf728bab5d9ec85127a624cb10eb' 
  AND token = 'K//EF6xXbFRT8mRNtVl3OqNJS3LZokVw2X+808W1dWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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