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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7038b6b98e554328a88206e8a15f1bda7e75d31e1b1bdb535971f6a2f3a5ec29' 
  AND token = 'RXVZnnlPwzyx9kou1wUR1ydK98u4vpfGgSi34tVHvkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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