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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd52416102d2d99ca287bf61691125602d146dabbb5f7bd0598d76ed62767912' 
  AND token = 'n+qwvR8+gGEL68lEtrx6tIUXX0q7JoFflltDljLQ9uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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