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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6819625831217c5683da15b5f270fd3a311976257a00af3c1fef17a41f1a5f4' 
  AND token = '+AxjjgIg9PWPmD7m59mCDy7plS4sdvt2gXaCnc31h+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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