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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5f5649f2d083799cdede1d173a2342bac4b1b09bef353759f4d6b5c7c82ece9' 
  AND token = 'T6RK4bd/Oz78KmiTw05qTLnCfsr2FHL5PAIWA2rg7o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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