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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41941f9919249d74fb670e766f988aee58d3edf362990ea4b101447c5634936b' 
  AND token = 'XubvP2mXh87fb6a5eOpWDgcMrODQ75ZUFm7reuZyTZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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