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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e71dee0f916cf7531cedd9685022cafae019c2a2bbcea75f535d53be2d298f1f' 
  AND token = 'or/pCOfw3nDenJtCWXv2Iaaafbtyzaat4PiYZUrsI98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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