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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bbdd64ca49db17c484ee6d8a3d0b5f194266d616e07801115a6d09c50282a2b' 
  AND token = 'j1g7I7LE8okP4KTF+795wjkanMreuwUGvXF/ws5btbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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