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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '402d443723d2520ced24990013843387c48c9856ebe09f826707345ac0b006b1' 
  AND token = 'e9IKR7E74/NDL+ING2vixiIFMt59Q2wA1tePy8uDtho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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