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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d899769cfe6580e0b75667df6aa4102fca2b1bc0a4a3cc01af4692ba6aaa350' 
  AND token = '1zprXfrh4AidkHNBhCEC4vSblsbgOWttX2edIVtk9MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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